package cn.com.inossem.utils;

import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.util.Log;

public class PackageUtil {

	public static String getVersionName(Context context) {
		String versionName = "";
		try {
			PackageManager pm = context.getPackageManager();
			PackageInfo pi = pm.getPackageInfo(context.getPackageName(), 0);
			versionName = pi.versionName;
			if (versionName == null || versionName.length() <= 0) {
				return "";
			}
		} catch (Exception e) {
			Log.e("VersionInfo", "Exception", e);
		}
		return versionName;
	}

	public static int compareVersion(String version1, String version2) {
		if (version1.equals(version2)) {
			return 0;
		}
		String[] version1Array = version1.split("\\.");
		String[] version2Array = version2.split("\\.");
		int index = 0;
		int minLen = Math.min(version1Array.length, version2Array.length);
		int diff = 0;
		while (index < minLen
				&& (diff = Integer.parseInt(version1Array[index])- Integer.parseInt(version2Array[index])) == 0) {
			index++;
		}
		if (diff == 0) {
			for (int i = index; i < version1Array.length; i++) {
				if (Integer.parseInt(version1Array[i]) > 0) {
					return 1;
				}
			}
			for (int i = index; i < version2Array.length; i++) {
				if (Integer.parseInt(version2Array[i]) > 0) {
					return -1;
				}
			}
			return 0;
		} else {
			return diff > 0 ? 1 : -1;
		}
	}
	
	public static void main(String[] args) {
		System.out.println(compareVersion("0.9.2", "0.9.1"));
	}
}
